Norris peters co



No. 622,045. Patented Mar. 28, I899. A. HEIN.

SURVEYING OR ASTRONOMICAL INSTRUMENT.

(Application filed May 14, 1698.) Modem 2 Sheets-Sheet I.

WITNESSES we Noam PETERS 120., Pno'mumm wxsnmcwou. n. c.

No. 622,045. Patented Mar. 28, I899.

A. HEIN.

SURVEYING 0R ASTRONOMIGAL INSTRUMENT.

(Application filed May 14, 1898.)

(No Model.)

2 Sheets8heat 2.

w Min WITNESSES imfl 4 YHE NORRIS PETERS cu. wruno-Ln-nc.v WASHINGTON, oc.

llm'r'nn ,TATES ADOLF I-IEIN, OF HAGEN, GERMANY.

- SURVEYING OR ASTRONOMICAL INSTRUMENT.

SPECIFICATION forming part of Letters Patent No. 622,045, dated March28, 1899. Application filed May 14,1898. Serial No. 680,690. (No model.)

To a whom it may concern:

Be it known that I, ADOLF HEIN, engineer, of Hagen, Vestphalia, in' theGerman Empire, have invented certain new and useful Im-' provcments inSurveying or Astronomical Instruments, of which the following is aspecification.

This invention relatesvto surveying, astronomical, and kindredscientific instruments; and the object of the invention is to providemeans for setting the instrument firmly against dislocation when itsproper adjustment has been secured.

The invention consists in the combination, with the table of a surveyinginstrument, of a plumb-rod, a hemispherical head on said plumb-rod,means for pivotally supporting said head adjacent to said table, meanson said head for supporting asurveying instrument, a clamping-ringsupported on springs above said table, a lever for depressing saidclamping-ring into contact with the head, said lever bearing on saidclamping-ring at diametrically opposite points of the same, and meansfor locking said lever in depressed position on said bearing-ring, and,further, in the specific means for supporting and guiding saidclamping-ring and for adjusting said,

head relatively thereto for regulating the pressure of the ring on thehead, as will be fully described hereinafter and finally pointed out inthe claims.

In the accompanying drawings, Figure 1 is a side elevation of asurveying instrument and tripod provided with my improved means forsetting the same. Fig. 2 is a sectional View showing the clamping-ringraised from the hemispherical head, and Fig. 3 is a sectional viewshowing the clamping-ring depressed and lockin g the instrument in theposition in which it has been set by the plumb.

Similar letters of reference indicate corresponding parts.

rests at its lower concaved end a pivot-screw s, which is adjustable inthe hollow hemi= spherical head a of the pin mb-rod c, said screwserving to regulate the height of the head relatively to the tableA andto the clamping means supported above said table and hereinafterdescribed. At its upper end said screw 8 is provided with a broad head,upon which are supported the telescope d and other parts of thesurveying instrument. Above the table of the instrument is guided onpins h a concaved clamping-ring 0, which is provided with anupwardly-extending flange b and supported by helical springs 2' on saidpins h. Above said clamping-ring 0 is arranged a lever Z, which ispivoted at one end, at 7.2, toan upright standard supported on the tableA. From the other end of the lever extends in downward direction a link19, which is guided at its lower slotted portion on apin q, fixed in thetable A. The lever Z is pro-v vided at each side at points diametricallyopposite across the bearin g-rin g with bearingpins m. To the lower endof the link 13 is pivoted a cam-lever a", which is retained through thetension of the springs 2' against the under side of the table A,with thehandle dropped normally in the released position of the clamping-ring,as shown in Fig.' 2.

The tripod having been located in the desired spot and the plumb havingcome to a stop, to set the instrument rigidly in its proper positionall. that is necessary is to press the lever r in under the table of theinsprings i raise the same, together with the ICC the tripod be changed.By means of the setscrew 8 it is possible to raise or lower thehemispherical head a relatively to the clamping-ring and therebyregulate the pressure to be put on the same when the cam-lever isoperated. There are preferably employed four pins h with thecorresponding springs i, and these four pins are arranged at the fourpoints of a square or diamond, the forward pin being arranged oppositethe link and the rear pin diametrically opposite to the forward pinacross the hemispherical head. The bearing-pins m are then located onthe lever Z, so that they bear on the clamping-ring at points oppositethe side pins h and at points diametrically opposite on theclamping-ring. By the employment of this or an equivalent regulardisposition of the pins 7L and springs 1', together with the use ofv thebearing-pins m at proper points, there is obtained a direct downwardthrust of the clamping-ring, which firmly sets the instrument in theexact position into which it has been brought by the plumb without theslightest sidewise dislocation.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. The combination, with the table of a surveyinginstrument, of a plumb-rod, a hemispherical head on said plumb-rod,means for pivotally supporting said head adjacent to said table, meanson said head for supporting a surveying instrument, a clamping-ringsupported on springs above said table, a lever for depressing saidclamping-ring into contact with the head, said lever bearing on saidclamping-ring at diametrically opposite points of the same, a linkextending from said lever, mean s on said table for guiding said link,and a cam-lever pivoted to said link and bearing at its cam portionagainst said table for locking said lever in depressed position on saidbearing-ring, substantially as set forth.

2. The combination, with the table of asnrveying instrument, of aplumb-rod, a hollow hemispherical head on said plumb-rod, a pivot-screwadjustable in said head and supported on a bearing-point on saidtable,means on said head for supporting a surveying instrument, uprightpins on said table, springs on said pins, a clamping-ring guided on saidpins, a lever for depressing said clampingring into contact with saidhead, a link extending from said lever, means on said table for guidingsaid link, and a cam-lever pivoted to said link and bearing at its camportion against said table for locking said clamping-ring in depressedposition, substantially as set forth.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

ADOLF IIEIN.

\Vitnesses:

EDWIN Wmss, IIERMANN BARTUP.

